69 lines
1.8 KiB
Arduino
69 lines
1.8 KiB
Arduino
|
// Ported to SdFat from the native Arduino SD library example by Bill Greiman
|
||
|
|
// On the Ethernet Shield, CS is pin 4. SdFat handles setting SS
|
||
|
|
const int chipSelect = 4;
|
||
|
|
/*
|
||
|
|
SD card read/write
|
||
|
|
|
||
|
|
This example shows how to read and write data to and from an SD card file
|
||
|
|
The circuit:
|
||
|
|
* SD card attached to SPI bus as follows:
|
||
|
|
** MOSI - pin 11
|
||
|
|
** MISO - pin 12
|
||
|
|
** CLK - pin 13
|
||
|
|
** CS - pin 4
|
||
|
|
|
||
|
|
created Nov 2010
|
||
|
|
by David A. Mellis
|
||
|
|
updated 2 Dec 2010
|
||
|
|
by Tom Igoe
|
||
|
|
modified by Bill Greiman 11 Apr 2011
|
||
|
|
This example code is in the public domain.
|
||
|
|
|
||
|
|
*/
|
||
|
|
#include <SdFat.h>
|
||
|
|
SdFat sd;
|
||
|
|
SdFile myFile;
|
||
|
|
|
||
|
|
void setup() {
|
||
|
|
Serial.begin(9600);
|
||
|
|
while (!Serial) {} // wait for Leonardo
|
||
|
|
Serial.println("Type any character to start");
|
||
|
|
while (Serial.read() <= 0) {}
|
||
|
|
delay(400); // catch Due reset problem
|
||
|
|
|
||
|
|
// Initialize SdFat or print a detailed error message and halt
|
||
|
|
// Use half speed like the native library.
|
||
|
|
// change to SPI_FULL_SPEED for more performance.
|
||
|
|
if (!sd.begin(chipSelect, SPI_HALF_SPEED)) sd.initErrorHalt();
|
||
|
|
|
||
|
|
// open the file for write at end like the Native SD library
|
||
|
|
if (!myFile.open("test.txt", O_RDWR | O_CREAT | O_AT_END)) {
|
||
|
|
sd.errorHalt("opening test.txt for write failed");
|
||
|
|
}
|
||
|
|
// if the file opened okay, write to it:
|
||
|
|
Serial.print("Writing to test.txt...");
|
||
|
|
myFile.println("testing 1, 2, 3.");
|
||
|
|
|
||
|
|
// close the file:
|
||
|
|
myFile.close();
|
||
|
|
Serial.println("done.");
|
||
|
|
|
||
|
|
// re-open the file for reading:
|
||
|
|
if (!myFile.open("test.txt", O_READ)) {
|
||
|
|
sd.errorHalt("opening test.txt for read failed");
|
||
|
|
}
|
||
|
|
Serial.println("test.txt:");
|
||
|
|
|
||
|
|
// read from the file until there's nothing else in it:
|
||
|
|
int data;
|
||
|
|
while ((data = myFile.read()) >= 0) Serial.write(data);
|
||
|
|
// close the file:
|
||
|
|
myFile.close();
|
||
|
|
}
|
||
|
|
|
||
|
|
void loop() {
|
||
|
|
// nothing happens after setup
|
||
|
|
}
|
||
|
|
|
||
|
|
|